Initialize osprofiler in Nova Cell configs
Initialize osprofiler in Nova Cell configs

Nova Cell conductor has its own config file and Devstack plugin
should update it when osprofiler is enabled.

Change-Id: Iaa6a8de9ab9d8a27ff9bf9d56ee62cd8d290609a
Closes-Bug: #1731856

openstack/osprofiler,stackforge/osprofiler,openstack/osprofiler,stackforge/osprofiler,stackforge/osprofiler,openstack/osprofiler